Posture.io hack has been developed by Joe Heenan. It combines a Texas Instruments Bluetooth Low Energy sensor (which costs $20-$30) attached to the back of an office chair with velcro, and an adhesive magnetic rubber strip that's stuck to the back of the wearer's belt. The TI sensor detects the distance and angle of the magnetic strip on the belt to determine if the wearer is sitting up straight or slouching. The application uses the data to keep a tab on the wearer's posture score throughout the day and encourages them to sit better or slouch less, without being too obtrusive.
A secondary component of Posture.io uses the Leap Motion gesture controller to direct the user to perform atypical hand exercises which are designed to relieve the damaging repetition of typing. It is capable of pushing reminder notifications to the Pebble smartwatch and also generating an Outlook calendar reminder for the user to perform micro exercises if a user's score looks bad enough.